Using _atom_site_disorder_* data names to describe compositional disorder?

[James H]

Dear Core DMG,

It has been noticed [1] that the _atom_site_disorder_* data names, which
are designed to describe positional disorder of a group of bonded atoms,
could also be used to describe compositional disorder, where one site is
randomly occupied by one of two (or more) atom types. Vol G First edition
describes two other methods for recording compositional disorder, and only
talks of positional disorder of a group of atoms when discussing the
_atom_site_disorder_* data names. It seems clear that these data names were
designed with groups of atoms in mind, but nothing seems to explicitly
exclude using them for compositional disorder.

The question for you all is, are there any objections or problems any of
you can see with explicitly allowing compositional disorder to be described
using _atom_site_disorder_* data names?

thanks,
James.

[1] https://github.com/COMCIFS/cif_core/issues/251
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